Talvez deva tentar algumas variações de ortografia:
complex concept » complex concepts (Expandir a Pesquisa), complex context (Expandir a Pesquisa), complex connects (Expandir a Pesquisa)
ift complex » joint complex (Expandir a Pesquisa), giant complex (Expandir a Pesquisa), coat complex (Expandir a Pesquisa)
pina carlos » pena carlos (Expandir a Pesquisa), pineda carlos (Expandir a Pesquisa), ospina carlos (Expandir a Pesquisa)
carlos nara » carlos lara (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos jara (Expandir a Pesquisa)
hobbs john » hobbs jean (Expandir a Pesquisa)
john agnew » john bagnell (Expandir a Pesquisa)
concept n » concept _ (Expandir a Pesquisa), concept a (Expandir a Pesquisa), concept 2 (Expandir a Pesquisa)
nacl pina » nacl na (Expandir a Pesquisa), nacl para (Expandir a Pesquisa)
7.5 nacl » 3.5 nacl (Expandir a Pesquisa), 0.9 nacl (Expandir a Pesquisa)
l hobbs » j hobbs (Expandir a Pesquisa), _ hobbs (Expandir a Pesquisa), m hobbs (Expandir a Pesquisa)
_ ift » _ ifn (Expandir a Pesquisa), _ ict (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( j l hobbs john agnew ) OR ((( _ ift complex concept n ) OR ( 7.5 nacl pina carlos nara ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l hobbs john agnew ) OR ((( _ ift complex concept n ) OR ( 7.5 nacl pina carlos nara ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l hobbs john agnew ) OR ((( _ ift complex concept n ) OR ( 7.5 nacl pina carlos nara ))))*.